Debian Continuous Integration

The Debian continuous integration (debci) is an automated
system that coordinates the execution of automated tests against packages
in the Debian system.
debci will continuously run autopkgtest test
suites from source packages in the Debian archive.

Documentation for package maintainers

The FAQ for package maintainers contains useful
information on how to declare the test suite, how the test is executed, how
to reproduce the test runs locally, etc.

Additionally, we have these extra tutorial-style documentation:

Functional testing of Debian packages, a tutorial
transcribed from a DebConf15 talk on autopkgtest and debci is available
that covers declaring test suites, issues to consider, and tips and
tricks.